Glue-testing process and apparatus.



No. 896,191. I

. 0. M. ZIMMERMAN.

GLUE TESTING PROCESS AND APPARATUS. APPLICATION FILED MAY 28, 1907.

F' ,2, -F" .3. 7 g 7 6' c WITNESSES I /A/ VEN TOR CYaarles J1. Zz'vznzez'man ATTOHNEYS- PATENTED' AUG. 18, 1908.

CHARLES M. ZIMMERMAN, OF CINCINNATI, OHIO.

GLUE-TESTIN G PROGESS AND APPARATUS.

Specification of Letters Patent.

Patented Aug. 18, 1908.

Application filed May 28, 1907. Serial No. 376,093.

To all whom it may concern:

Be it known that I, CHAELEs M. ZIMMER- MAN, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Glue-Testing Process and Apparatus, of which the following is a full,

- clear, and exact description.

This invention is an improved glue testing process and apparatus, the object of which is to ascertain the tensile strength of glue as applied to wood. By the term tensile I mean both the cohesiveness and adhesiveness of the glue. I preferably accomplish this object by affixing to a suitable support with the glue to be tested, one end of an overhanging arm, the portions of the arm and support which are joined through the glue being of wood and of a known area. At or near the overhanging end of the arm at a predetermined distance from the support, a successively-increasing force is applied until the connection between the arm and support breaks. This force multiplied by the lever arm which is the distance from the point of the application of the force to the support, gives the required moment or the tensile strength of the glue per area glued.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the fig-v ures.

'Figure 1 is a side elevation of the preferred form of my apparatus by which I carry out my improved process; Fig. 2 is a section on the line 2-2 of Fig. 1, looking in the direction of the arrows, and Fig. 3 is a view of the lower portion of the weight hanger with the weights applied thereto, looking in a direction at right angles to Fig. 1.

I preferably carry out my invention by providing a standard 1, which is attached to a wall or other support by a cross-beam 2, the latter serving to carry a horse-shoe weight hanger 3 through the intermediary of a chain and eyebolt 4 and 5 respectively, the eyebolt being passed through an aperture in the beam 2 to which it is attached. The lower extremities of the Weight hanger 3 are joined together by a cross-bar 6 which forms a support for removable slotted weights 7 of like form and specific gravity, a pile of such weights being adapted to be placed on each branch of the weight hanger.

Within the space inclosed by the standard 1 and cross-beam 2, is a standard 8 carrying at its upper end a supporting arm 9, the latter being detachable and horizontally disosed and constructed of wood. To the top face of the arm 9 adjacent to that end carried by the standard 8, is joined with the glue to be tested, an overhanging arm of wood, the surfaces of the supporting arm 9 and the arm 10 attached through the glue being of known area, preferably a square inch or some multiple thereof.

Tothe outer overhanging end of the arm a predetermined distance from the end of the support at which the moment takes place, is applied the weight hanger 3, the said hanger belng provided with a ring 11 connected to its upper end for this purpose. I/Veights 7 are uniformly and successively placed on each branch of the weight hanger 3, which is continued until the glued connection between the arm and support breaks, the drop of the hanger and weights to the floor belng prevented by the chain 4. The weights which are applied to the hanger 3 are noted and the total or combined weight of the same multiplied by the distance between the point of application of the ring 11 to the arm 10 and the adjacent end of the supporting arm 9, which gives the moment about the point of support or the tensile strength of the glue per area joined.

The construction for carrying out the procnumerous 1particulars within the scope of the annexed c aims.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1. The herein described process for testing glues, which consists in gluing with the glue to be tested a known area of an overhanging arm to a support near one end thereof, andthen applying a successively increasing force to the opposite and overhanging end of said arm a predetermined distance from the glued portion thereof.

2. The herein described process for testing glues, which consists in gluing with the glue to be tested a known area of one face of an overhanging arm adjacent to one end there- I 3.- A glue-testing apparatus comprising a support, an overhanging arm glued at one end to said support, and a Weight hanger adapted to be applied to theoverhangingrend of said arm a predetermined distance from the glued portion thereof, having means for carrying a number of removable Weights.

4. A glue-testing apparatus comprising a support, an overhanging arm glued at one end to said support, a Weigh-thanger adapted to be applied to the overhanging end of said arm a predetermined distance from the glued portion thereof, having means for carrying a number of removable Weights, and means 1ndependent of saidarm for suspending said 15 CHARLES M. ZIMMERMAN.

Witnesses:

AUGUST GoEsER, JNo. J. CLEGG. 

